If you're looking to up your game on the track, the Advanced Clutch HD/Race Rigid 4 Pad Kit ZM1-HDR4 is worth a serious look. This kit packs some serious punch with ACT's Heavy Duty pressure plate, which has become a favorite among enthusiasts. What makes it stand out? Well, it’s all in the diaphragm design. This unique setup boosts clamp load and minimizes deflection, meaning your clutch is going to last longer and perform better under pressure.

Each diaphragm goes through a rigorous four-stage heat-treating process. This isn't just marketing fluff; it genuinely enhances performance. The precision cover stampings add that extra bit of rigidity and consistency you want when you're pushing your car to the limit. And let’s not forget about the 4-pad rigid race discs—they’re crafted from high-quality ceramic friction materials, so they can handle the heat without breaking a sweat.

Now, the chrome-moly hub? It’s heat-treated for added strength and durability, which is crucial when you’re shifting gears at high RPMs. Speaking of shifting, the lightweight, rigid design allows for quicker shifts, giving you that edge when you need it most. Just be aware that with the 4-pad rigid race disc, the engagement can be a bit harsher, but hey, faster shifts mean you're going to be leaving your competition in the dust.

This kit is particularly suited for smaller engines, thanks to the smaller disc sizes. You’ll find it’s designed for light to moderate pedal effort, but don’t let that fool you—expect some aggressive engagement and a bit of gear rattle. It’s built for race use, so if you’re serious about your performance, this is a solid choice.

Install Instructions:

• For Instructions CLICK HERE

Features:

• Light to moderate pedal effort with aggressive engagement
• Moderate friction life, but extended thanks to ACT's diaphragm design; just keep an eye on spline wear
• Engineered and assembled with precision, using select ceramic materials for high heat tolerance
• Best suited for race scenarios
• 100% clamp load tested and dynamically balanced for smooth high RPM reliability

Specifications:

• Clutch Master Cylinder Included: No
• Grease Included: Yes
• Grade Type: Performance
• Pilot Bushing Included: No
• Pressure Plate Type: Heavy Duty
• Release Bearing Included: Yes
• Clutch Disc Diameter: 7.9 in (200 mm)
• Disc Material: Ceramic
• Input Spline Quantity: 22
• Input Shaft Diameter: 0.9375 in
• Alignment Tool Included: Yes
• Disc Type: Solid
• Pressure Plate Bolts Included: No
• Clutch Slave Cylinder Included: No
• Flywheel Bolts Included: No
• Pilot Bearing Included: Yes
• Product Weight: 10.3 lbs
• Torque Capacity: 250 ft/lbs
• Torque Capacity Over OE: 0.86

Notes:

• Must be used with a factory flywheel.

This kit is a perfect fit for the Mazda Miata 1990-1993. If you're ready to take your performance to the next level, this clutch kit is a solid investment.